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https://github.com/FFmpeg/FFmpeg.git
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80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
/*
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* H.261 common code
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2004 Maarten Daniels
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.261 codec
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*/
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#include "h261.h"
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#include "mpegvideo.h"
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#define IS_FIL(a) ((a) & MB_TYPE_H261_FIL)
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static void h261_loop_filter(uint8_t *src, ptrdiff_t stride)
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{
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int x, y;
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int temp[64];
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for (x = 0; x < 8; x++) {
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temp[x] = 4 * src[x];
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temp[x + 7 * 8] = 4 * src[x + 7 * stride];
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}
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for (y = 1; y < 7; y++) {
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for (x = 0; x < 8; x++) {
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ptrdiff_t xy = y * stride + x;
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ptrdiff_t yz = y * 8 + x;
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temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride];
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}
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}
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for (y = 0; y < 8; y++) {
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src[y * stride] = (temp[y * 8] + 2) >> 2;
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src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2;
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for (x = 1; x < 7; x++) {
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ptrdiff_t xy = y * stride + x;
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ptrdiff_t yz = y * 8 + x;
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src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4;
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}
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}
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}
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void ff_h261_loop_filter(MpegEncContext *s)
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{
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H261Context *const h = s->private_ctx;
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const ptrdiff_t linesize = s->linesize;
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const ptrdiff_t uvlinesize = s->uvlinesize;
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uint8_t *dest_y = s->dest[0];
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uint8_t *dest_cb = s->dest[1];
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uint8_t *dest_cr = s->dest[2];
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if (!(IS_FIL(h->mtype)))
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return;
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h261_loop_filter(dest_y, linesize);
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h261_loop_filter(dest_y + 8, linesize);
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h261_loop_filter(dest_y + 8 * linesize, linesize);
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h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
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h261_loop_filter(dest_cb, uvlinesize);
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h261_loop_filter(dest_cr, uvlinesize);
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}
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